Which would be a shame given how well Parallel works on Catalina. At least that is going to be usable for more than 12 months and will support more than a single major release of macOS. VMware Fusion harnesses visualization to give you a powerful tool to run PC applications and devices on your Mac. If v15 is not going to work on Big Sur I am definitely going to abandon Parallels again and purchase a VMware Fusion Pro license. I have just recently purchased a license and am definitely not interested in a) a yearly software subscription, or b) yearly mandatory paid upgrades because they refuse to support their software for more than 12 months or more than one major macOS release. I really hope that Parallels is going to continue supporting v15 on Big Sur. Microsoft has a fairly extensive algorithm to determine when a re-activation is required. It probably depends on the amount and extent of virtual hardware changes. What happens is Parallels Desktop and VMWare Fusion hides the whole Windows guest OS and only reveals the window of the application on your Mac Desktop. On the other hand, the top reviewer of VMware Fusion writes. Parallels Desktop is rated 0.0, while VMware Fusion is rated 9.0. Parallels Desktop is ranked 14th in Virtual Desktop Infrastructure (VDI) while VMware Fusion is ranked 7th in Virtual Desktop Infrastructure (VDI) with 2 reviews. However, when I first migrated a Windows 10 VM von VirtualBox to Parallels on my iMac it did. 611,688 professionals have used our research since 2012.

I migrated two VMs from VirtualBox to Fusion (1x Windows 7, 1x Windows 10) on my MacBook, which did not trigger Activation.

Parallels versus fusion